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Kevin Weddle

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Filters are generally composed of capacitors, inductors and resistors so your qestion doesn't make any sense.

Do you mean active filters?

Yes, active filters do have the advantages of bbeing able to drive low impedance loads and have amplification whic passive filters do not.

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  • 2 weeks later...

While they were available, I used National Semiconductor LMF40 high performance 4th-order switched-capacitor Butterworth lowpass filter ICs for many applications.
The cutoff was sharp and could be tuned over a wide frequency range with the built-in clock oscillator or an external oscillator.
I even cascaded them in series for a very sharp cutoff.
The distortion was extremely low.

I used an LMF100 switched capacitor IC to make a tracking notch filter for my distortion analyser.

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